Temperature sensors help engineers reduce design complexity

25th October 2018
Lanna Cooper

Texas Instruments has introduced a new temperature sensor family that offers ±0.1°C accuracy across a wide temperature range and helps simplify system design for industrial and medical applications. The TMP117 is the first single-chip temperature sensor to offer similar performance to platinum Resistance Temperature Detectors (RTDs) while significantly reducing design complexity and power consumption, and the digital temperature sensor for medical applications, supports requirements for medical thermometers.

The new devices enable engineers to more quickly develop highly accurate, ultra-low power patient monitoring, field transmitter and metering applications.

Achieve high accuracy without calibration
Delivering ±0.1°C accuracy across a wide range, with zero calibration during manufacturing, the new sensor family saves designers time and reduces production costs for systems requiring high accuracy.

  • Supports clinical temperature requirements: For medical applications, the TMP117M provides ± 0.1°C accuracy from 30°C to 45°C and supports American Society for Testing and Materials (ASTM) E1112 and International Organisation for Standardisation (ISO) 80601 requirements for patient thermometers.
  • Achieve Class-AA RTD accuracy for industrial applications:

The TMP117 provides a direct readout of temperature, with no additional linearisation or acquisition error, and maintains accurate temperature over a wide range:

  • ±0.1°C from -20°C to +50°C.
  • ±0.15°C from -40°C to +50°C.
  • ±0.2°C from -40°C to +100°C.
  • ±0.25°C from -55°C to +125°C.
  • ±0.3°C from -55°C to +150°C.

Minimise system and software complexity
TI's new digital temperature sensors enable engineers to:

  • Reduce system complexity: With the TMP117, engineers gain the accuracy required for their application without the design and manufacturing complexity of typical solutions. Comparatively, to achieve a similar level of accuracy with a platinum RTD, engineers must select a multitude of precision components, simulate and fine-tune the circuit, carefully lay out the PCB to avoid impedance mismatches, develop software to linearise the output and calibrate each system.
  • Accelerate design time: The TMP117 and TMP117M are I2C- and SMBus-interface compatible and provide a direct digital readout of the temperature, which significantly reduces design, layout and simulation time, and speeds time to market.

Slash power usage by up to 95%
Using only 6.3µW, the TMP117 and TMP117M enable engineers to achieve longer battery life and more accurate temperature measurement in their designs.

  • Use significantly less power: The TMP117 consumes up to 95% less power than a typical RTD measurement system, enabling designers to meet tight power budgets in field transmitters or battery-powered applications.
  • Minimise the impact of self-heating: The low power consumption of the TMP117 and TMP117M minimises the impact of self-heating, enabling more accurate temperature measurement.

The TMP117 and TMP117M join TI's portfolio of digital temperature sensors that enable engineers to integrate smart thermal monitoring into their designs, choosing from high accuracy, low power and small-package options.

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